Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2012

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Effect on operations of the pension plans

	Principal Pension Plans
	Three months ended September 30				Nine months ended September 30
(In millions)	2012		2011		2012		2011
Service cost for benefits earned	$	356	$	296	$	1,044	$	857
Prior service cost amortization		70		49		210		144
Expected return on plan assets		(939)		(984)		(2,830)		(2,953)
Interest cost on benefit obligation		619		665		1,858		1,995
Net actuarial loss amortization		855		584		2,565		1,752
Pension plans cost	$	961	$	610	$	2,847	$	1,795

	Other Pension Plans
	Three months ended September 30				Nine months ended September 30
(In millions)	2012		2011		2012		2011
Service cost for benefits earned	$	98	$	70	$	292	$	210
Prior service cost amortization		1		4		3		12
Expected return on plan assets		(155)		(151)		(467)		(451)
Interest cost on benefit obligation		128		131		385		387
Net actuarial loss amortization		69		34		209		103
Pension plans cost	$	141	$	88	$	422	$	261

Effect on operations of principal retiree health and life insurance plans

	Principal Retiree Health
	and Life Insurance Plans
	Three months ended September 30				Nine months ended September 30
(In millions)	2012		2011		2012		2011
Service cost for benefits earned	$	58	$	48	$	168	$	140
Prior service cost amortization		126		163		418		482
Expected return on plan assets		(19)		(24)		(56)		(72)
Interest cost on benefit obligation		123		151		381		452
Net actuarial loss / (gain) amortization		8		(27)		8		(83)
Net curtailment / other gain		(39)		0		(39)		0
Retiree benefit plans cost	$	257	$	311	$	880	$	919